I estimate my income at 200% FPL and receive the appropriate subsidy and low deductible plan. I am a heavy user. At year end I get those unintended, unknown Cap Gain distributions. Oh, golly, I owe the difference between the 350% FPL and 200% FPL premiums. But do I get to keep the savings of being on a low deductible, low copay plan? I don't see how they will deal with this, although anything is possible.
i think they make adjustmants in the following years' tax form